All of you are losers!

(j/k)
The problem with putting all the blame, or all the credit on one person is it negates the whole Spurs winning concept: They are a team. They sometimes lose as a team, and they WIN as a team.
BUT, if you want to look at Specifics of what individuals did to help turn around an embarrassing loss on Sunday:
Pop starts Barry over Manu. The kind of Ballsy move some Pop-haters were calling for. As for Pop not being able to win close games, well, if you coach well enough from the start, you don't have to!
Tim back in groove. Although still not 100%, it's pretty obvious Tim is back, both from his play AND his leadership ability (like when he huddled everyone at the start of the 3rd when the Nuggets were on a roll, and told everyone "Move the ball, move the ball").
Tony Parker: Let's not forget about the guy who took MOST of the media blame for Sunday's loss, even though he actually played pretty good in the first game (about same shooting % and same assists, but less turnovers and less minutes in the second).
I could go on and on about every player who stepped up, but that's the point:
The TEAM lost on Sunday. The TEAM won last night.
If the TEAM can stay together and play like that every night, then this series is over in 5.